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Commuter mdt altitude deviation excursion from clearance altitude in response to ground proximity warning system on airway between hpn and ign.
| Attributes | |
| ACN | 195230 |
| Time | |
| Date | 199111 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ign |
| State Reference | NY |
| Altitude | msl bound lower : 3000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, High Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | enroute airway : v157 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 273 flight time total : 4781 flight time type : 2864 |
| ASRS Report | 195230 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
This was a ferry flight from kingston to white plains, ny. This was a short flight segment so ATC leveled us at 3000 ft. There is some abrupt terrain between newburgh, ny and westchester county airport. The ground proximity warning system didn't like the sudden closure rate on the terrain. At first it dictated a terrain warning but when the radar altimeter went from about 2500-1600 ft it dictated that we 'pull up', so we did, informed ATC of our actions and climbed to 4000 ft. We were pretty sure that there was not a real need to climb, but this is not a familiar route between these 2 airports and with no visibility we had to comply with the ground proximity warning system command. ATC inquired as to the reason for our need to climb. We explained the ground proximity warning system command. That was it.
Original NASA ASRS Text
Title: COMMUTER MDT ALTDEV EXCURSION FROM CLRNC ALT IN RESPONSE TO GND PROX WARNING SYS ON AIRWAY BTWN HPN AND IGN.
Narrative: THIS WAS A FERRY FLT FROM KINGSTON TO WHITE PLAINS, NY. THIS WAS A SHORT FLT SEGMENT SO ATC LEVELED US AT 3000 FT. THERE IS SOME ABRUPT TERRAIN BTWN NEWBURGH, NY AND WESTCHESTER COUNTY ARPT. THE GND PROX WARNING SYS DIDN'T LIKE THE SUDDEN CLOSURE RATE ON THE TERRAIN. AT FIRST IT DICTATED A TERRAIN WARNING BUT WHEN THE RADAR ALTIMETER WENT FROM ABOUT 2500-1600 FT IT DICTATED THAT WE 'PULL UP', SO WE DID, INFORMED ATC OF OUR ACTIONS AND CLBED TO 4000 FT. WE WERE PRETTY SURE THAT THERE WAS NOT A REAL NEED TO CLB, BUT THIS IS NOT A FAMILIAR RTE BTWN THESE 2 ARPTS AND WITH NO VISIBILITY WE HAD TO COMPLY WITH THE GND PROX WARNING SYS COMMAND. ATC INQUIRED AS TO THE REASON FOR OUR NEED TO CLB. WE EXPLAINED THE GND PROX WARNING SYS COMMAND. THAT WAS IT.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.